4J36 wire, also known as Invar 36 wire, is a low-expansion nickel-iron alloy containing approximately 36% nickel and the balance iron. The unique feature of this alloy is its exceptionally low coefficient of thermal expansion (CTE), making it stable across a wide temperature range. This property allows 4J36 wire to maintain its dimensional accuracy even under extreme temperature changes — a critical factor in aerospace, precision engineering, and cryogenic systems.
At DLX, we specialize in manufacturing high-precision 4J36 wires with consistent performance, fine-tuned microstructure, and high surface quality. Our production processes ensure the wire’s uniform expansion behavior, mechanical integrity, and superior machinability for demanding applications.
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The extremely low thermal expansion of 4J36 makes it irreplaceable in applications where temperature fluctuation could lead to dimensional instability or mechanical stress in precision systems.
1. Aerospace Engineering:
4J36 wire is used in gyroscopes, navigation devices, and satellite components where structural precision is vital under varying thermal environments. It prevents deformation or misalignment of components during flight cycles.
2. Cryogenic Systems:
In cryogenic storage and transportation, 4J36 maintains stability at temperatures approaching absolute zero. It’s commonly used in supports, sensors, and wiring in liquefied gas equipment.
3. Precision Instruments:
It serves in scientific measurement instruments, optical systems, and timing devices that demand sub-micron stability. The minimal thermal movement ensures accurate readings and mechanical reliability.
4. Telecommunications:
Used in high-frequency devices and sensor assemblies where temperature variation can affect performance, 4J36 provides consistent electrical and mechanical properties.
5. Semiconductor Equipment:
The alloy’s low CTE reduces stress in wafer alignment systems and tooling fixtures, improving precision and lifespan.
| Elements | 4J29 | 4J36 | |
| Carbon (C) | Not greater than | 0.03 | 0.05 |
| Sulfur (S) | 0.02 | 0.02 | |
| Phosphorus (P) | 0.02 | 0.02 | |
| Manganese (Mn) | ≤0.50 | 0.20-0.60 | |
| Silicon (Si) | ≤0.30 | ≤0.30 | |
| Nickel (Ni) | 28.5-29.5 | 35.0-37.0 | |
| Chromium (Cr) | - | - | |
| Cobalt (Co) | 16.8-17.8 | - | |
| Iron (Fe) | Rest | Rest | |
| Other Elements |
| Alloy Grade | 20°C-100°C | 20°C-300°C | 20°C-500°C |
| 4J36 Invar Alloy | 1.2×10⁻⁶ /°C | 2.5×10⁻⁶ /°C | - |
| 4J29 Kovar Alloy | 4.6×10⁻⁶ /°C | 5.5×10⁻⁶ /°C | 6.2×10⁻⁶ /°C |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Density (g/cm³) | 8.1 | 8.2 |
| Tensile Strength (MPa) | 500-600 | 600-700 |
| Yield Strength (MPa) | 250-350 | 300-400 |
| Hardness (HV) | 150-200 | 200-250 |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Electrical Resistivity (10⁻⁶ Ω·cm) | 80 | 50 |
| Thermal Conductivity (W/m·K) | 10-12 | 16-18 |
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With the rapid expansion of aerospace technology, quantum computing, and cryogenic transport, the global demand for low-expansion alloys like 4J36 is steadily increasing.
Modern applications, including superconducting systems and satellite payloads, demand even tighter control over dimensional stability. DLX’s advanced vacuum melting and cold drawing technologies enable the production of ultra-clean, high-uniformity 4J36 wires tailored for next-generation needs.
Environmental considerations are also shaping material selection. The long service life and recyclability of 4J36 wire align with the sustainability goals of high-tech industries, reducing waste and lifecycle emissions.
Why DLX 4J36 Wire?
At DLX, our focus isn’t just on producing alloy wire — it’s on delivering precision you can trust.
Compared to standard low-expansion materials, our 4J36 wire stands out in three key aspects:
-
Microstructural Control:
DLX utilizes precision annealing and vacuum melting to achieve a uniform grain structure. This ensures predictable expansion behavior, especially in cryogenic conditions. -
Dimensional Accuracy:
Our wire production lines can maintain diameter tolerances within ±0.005mm. This precision reduces calibration and assembly errors in aerospace or optical systems. -
Surface and Purity:
We adopt multi-stage polishing and oxide control to produce a bright, contamination-free surface — a critical requirement for vacuum and optical equipment. -
Custom Specifications:
DLX offers 4J36 wires in various diameters, tempers (soft/half-hard), and spool formats, tailored for your exact application environment.
Market Comparison
While many suppliers produce 4J36 wire, few can achieve the level of thermal consistency and metallurgical precision that DLX guarantees. Our production process integrates continuous testing for expansion coefficient uniformity, ensuring every meter of wire performs reliably.
For customers in aerospace or metrology industries, this reliability directly translates into lower calibration costs and longer service life of critical components.
Typical Specifications (Available at DLX)
| Property | DLX 4J36 Wire Specification |
|---|---|
| Diameter Range | 0.05 mm – 5 mm |
| Tensile Strength | 450–550 MPa |
| CTE (20–100°C) | ≤ 1.5 × 10⁻⁶ /°C |
| Resistivity | 0.78 μΩ·m |
| Form | Coil, straight wire, spool |
| Surface Finish | Bright / Oxide-free |
| Delivery Condition | Annealed / Cold Drawn |
About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications.
For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
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We support all kinds of testing:
FAQs
As industries demand more accuracy, lighter components, and higher reliability, low-expansion alloys like 4J36 will continue to play a central role. DLX is investing in further refining alloy purity and dimensional precision through advanced metallurgical and thermomechanical processes.
Our commitment is to help clients achieve performance stability — whether in cryogenic chambers or high-altitude satellites — by offering consistent, high-quality materials backed by technical expertise and responsive customer support.
1. What makes 4J36 wire different from regular steel wire?
Unlike steel, 4J36 has an extremely low thermal expansion coefficient, making it ideal for precision components exposed to temperature variations.
2. What temperature range can DLX 4J36 wire handle?
It remains dimensionally stable between -250°C and +200°C, suitable for cryogenic and aerospace environments.
3. Can DLX provide customized diameters or coils?
Yes. DLX can manufacture custom diameters, spool sizes, and mechanical tempers according to customer drawings.
4. Is 4J36 magnetic?
Yes, it’s ferromagnetic at room temperature but loses magnetism near its Curie point (~230°C).
5. Does 4J36 wire require special handling during machining?
It’s relatively soft and can be machined easily, but we recommend using controlled temperatures to prevent stress changes.
6. What are the main applications of DLX 4J36 wire?
Used in aerospace instruments, cryogenic equipment, optical devices, and precision measurement tools.
7. How does DLX ensure quality consistency?
Through advanced vacuum melting, dimensional inspection, and coefficient-of-expansion testing on each batch.
8. Can DLX export 4J36 wire globally?
Yes. DLX ships worldwide, supporting bulk and sample orders with international standards compliance.
